No, it's per update.
if you do not make such a thing abundantly clear in your description, your customers will be eglible for refunds.
naming the game with a version number is not enough. the default expectation is buying in early access. so the finished project is expected to be released on this page. if you do not intend to do so, you need to tell this.
also, your itch is not linked by your other socials like patreon.